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Give three features of an efficient exchange surface. Provide an example for each feature.

An efficient exchange surface should have a high surface area as this increases the rate at which diffusion can occur across it. For instance, roots have many root hair cells. These root hair cells have thin...
EH
Answered by Elliot H. • Biology tutor
16389 Views

How is a nerve impulse transmitted across a synapse?

Synapses are a gap or a junction between two neurones. When a nerve impulse is travelling along the axon of the first neurone and the impulse reaches the axon terminal (the end of the axon), a chemical calle...
SK
Answered by Smita K. • Biology tutor
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What strategies should I use to analyse the narrative voice?

Firstly, you should identify the point of view of the speaker - are they first person , second person or third person ? Is the narrator a character within the story; does the narrator refer to themselves as ...
MM
Answered by Mady M. • English tutor
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Explain the differences between diffusion, osmosis and active transport.

Diffusion is the movement of particles (gases and liquids) from an area of high concentration to an area of low concentration. No energy is required (it is a passive process).Osmosis is the movement of water...
RM
Answered by Rikesh M. • Biology tutor
5704 Views

2 sides of a right-angled triangle are 5cm and 6cm. Calculate the length of the hypotenuse.

You need to use Pythagoras's theorem which states that for any right angled triangle, a 2 +b 2 =c 2 , where c is the hypotenuse and a and b are the other 2 sides of the triangle. Therefore, in this case a an...
RM
Answered by Rikesh M. • Maths tutor
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